You Can Find Me Where The Sea Pours Into The Stars

ever since i was a little girl i knew i wanted to put no effort into my appearance

100% Ultramar Specific. Because they have their act together. Betterthan most of the Imperium.

The Emperor finding Angron half lobotomized and with a terminal brain disease is probably only kind of into the idea of servitorising all the primarchs + giving them brain cancer so he doesn't have to develop an extinction plan for 17 psychopaths. Really after Mort seething about kill stealing for their whole relationship - Why go involve himself in petty murders unless he gets something out of it like obedience. Theres no reason to help him. His actions in that situation actually seem logical to me so it's kind of confusing why people think its a plot hole.